There is a mixed view on synthetics in the engine on this board, but many have had great experience, including myself, with Castrol GTX(non-synthetic). SDPatt, owner of one of the higher millage cars on the board(over 240k+ I believe), recommends Castrol GTX as his engine is still clean and running strong. As for the tranny is concerned, many have had a great experience with Syncromesh, a product of GM. It can be had at most GM dealers or other companies make a similar product such as penzoil. I would however recommend getting the real stuff, kind of like getting a generic perscription vs the real deal headbang .